Hi,
I think it is historical. Rewrite rules, recompile, run regression tests
and publish the patch.
ср, 3 июня 2020 г., 22:26 Sebastian Riedel <s...@basxto.de>:
> Is there a reason why one wouldn't use: (z80/gbz80)
>
> replace restart {
> ld %2, %4
> ld %1, %3
> } by {
> ; brought register pair into uniform order
> ld %1, %3
> ld %2, %4
> } if canAssign(%1%2 '#0x0102'), notSame(%2, %3)
>
> replace {
> ld %1, #0x%3
> ld %2, #0x%4
> } by {
> ld %1%2, #0x%3%4
> ; combined constant loads into register pair.
> } if canAssign(%1%2 '#0x0102')
>
> instead of:
>
> replace {
> ld e, #0x%1
> ld d, #0x%2
> } by {
> ld de, #0x%2%1
> ; peephole 92 combined constant loads into register pair.
> }
>
> replace {
> ld d, #0x%1
> ld e, #0x%2
> } by {
> ld de, #0x%1%2
> ; peephole 93 combined constant loads into register pair.
> }
>
> replace {
> ld l, #0x%1
> ld h, #0x%2
> } by {
> ld hl, #0x%2%1
> ; peephole 94 combined constant loads into register pair.
> }
>
> replace {
> ld h, #0x%1
> ld l, #0x%2
> } by {
> ld hl, #0x%1%2
> ; peephole 95 combined constant loads into register pair.
> }
>
> replace {
> ld c, #0x%1
> ld b, #0x%2
> } by {
> ld bc, #0x%2%1
> ; peephole 96 combined constant loads into register pair.
> }
>
> replace {
> ld b, #0x%1
> ld c, #0x%2
> } by {
> ld bc, #0x%1%2
> ; peephole 97 combined constant loads into register pair.
> }
>
> --
> Freundliche Grüße / Yours sincerely
> Sebastian Riedel
>
>
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